464 



The Philippine Journal of Science 



1914 



Table XV. — Dipterocarps. Site I. 



forest in 



Philippines. One hectare of 

 Negros. 



virgin 



Diameter in centimeters. 



Basal 

 area. 



Volume. 



Diameter in centimeters. 



Basal 

 area. 



Volume. 



15. - 



sg. TO. 

 0.421 

 1.423 

 1.639 

 1.617 

 1.715 

 1.570 

 1.442 

 1.603 

 1.826 

 1.581 

 1.683 

 1.779 

 1.818 

 1.466 

 1.801 

 1.670 



CU. TO. 



1.02 

 7.25 

 9.53 

 16.81 

 18.57 

 17.87 

 16.67 

 19.21 

 23.31 

 20.28 

 22.18 

 24.48 

 26.78 

 21.14 

 19.02 

 22.76 



105 



sg. m. 

 2.198 

 1.664 

 1.400 

 2.067- 

 1.277 

 1.308 

 1.222 

 1.836 

 0.672 

 0.770 

 0.245 

 0.691 



CU. TO. 



33.87 



26.26 



21.61 



29.25 



21.17 



21.80 



20.79 



23.23 



8.87 



11.18 



4.30 



9.72 



26 — - — 



110 



35 - 



115 



40 



120 



45 



125 



60 



130 



55 . 



135..- 



60 



140 



65 _... 



146 



70.. 



150 



75 . . 



155 



80 



160 . 



85 



166 



90.... 



95 



100 



170 



0.248 



3.16 



Grand total 



39.261 



519. 58 





of time, diameters about twice as great as those of the oak 

 trees, this Negros forest is not in any way as successful in 

 regard to growth. As will be shown later in discussing rates 

 of growth, it is very evident that no such increased rate of 

 growth in virgin stands in the Philippines can be expected. 

 Such being the case, it is equally obvious that, taking our 

 curve for the oak forest of Germany as normal, our dipterocarp 

 forest in Negros is both extra normal and overmature; that 

 is, it is probable that we have in our largest virgin forest 

 of the Philippines both an overstocked and an overmature 

 condition. 



The dipterocarp forest under discussion here is a type of the 

 best forest produced in the Philippines in regard to both simpli- 

 city of composition and volume per hectare. It approaches as 

 nearly what the lumberman desires in forest growth as can 

 be expected of any virgin forest in the Philippines, but from 

 the standpoint of forest management, although the forester is 

 interested in the production of a large volume per hectare, it 

 cannot be said to be as satisfactory. From this standpoint the 

 first defect to be noted is that of excessive overmaturity. 

 Accompanying this is the fact that we have our volume dis- 

 tributed with fair regularity through a large number of diameter 

 classes without the representation in the smaller diameter 

 classes necessary for the successful reproduction of the forest 

 under any system of management, which takes into consideration 

 the problems of utilization and the excessively rapid reproduction 



